The speakers by themselves will not you a good "sound stage". Sound stage refers to your perceived location of the band when your speakers play. Since in a car environment the left side speakers are closer to you, this shifts the sound stage to the left and messes up the imaging. If you want good sound stage, you need advanced processing capability, such as time alignment and independent left and right equalizer. Otherwise, not even $1000 speakers will give you a truly good front stage without this. As for speakers choice, either run a coaxial speaker without any other tweeters or a component set, since each was meant to play without help of additional tweeters.